/Engine/Source/Runtime/MessagingRpc/Public/IMessageRpcServer.h
Add an RPC request handler.
void AddHandler ( const [FName](API\Runtime\Core\UObject\FName) & RequestMessageType, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IMessageRpcHandler](API\Runtime\MessagingRpc\IMessageRpcHandler) > & Handler )